Looking for some advice. I'm currently on a 2013 66" radar strada, but I think this may be too much ski for me and maybe holding me back a bit. I'm 5'9", weight approx. 155 lbs. to 165 lbs. during ski season and ski 15 off. The fastest speed I've skied where I've gotten all 6 balls is 32.4mph. I'd like to get to a point where I get all 6 consistently at 33 to 34mph. Am I going to benefit from going to a Senate Lithium, which appears to be more suited for the speed I ski at? Also, given my weight, and assuming you think the Senate is the way to go, would you recommend the 65" or 67"?